I know what you mean, I had a hard time figuring out my color scheme too.
My '87 is also a two tone, in the same style as yours with the stripes (I assume), but in gray and silver. The color code tag on my truck only lists the code for the color combo, H16, but not what the codes of the actual colors are. I think that on the '88 trucks it lists the whole thing, color combo code and actual paint color codes, but not in '87. Finally found the color codes with the help of another member here.

Now that you brought it up I'm still curious about the two sets of letter/numbers that are on the same line as the paint color codes. It would be interesting to find out what those mean.